Gas producing and heating



Dec. 18, 1928.

J. MACKENZIE v GAS IRODUCING AND HEATING APPLIANCE 2 Sheets-Sheet. V 1 B Filed Kay 22. 1925 h w my v a Q .N N I; W m QM Hahn I p n WM 7 w w 1 M *fl fi M l H I n \N a h w h WN MM NM f be 3 fi mm a J w QM I. I B m% w HW HIIWIEII .IIII {Hi1 I|.|.l| l NN Dec. 18, 1928.

J. MACKENZIE GAS PRODUCING AND HEATING APPLIANCE Filed flay 22. 1925 2 Sheets-Sheet 2 i MH h r a N Il dd v v I um MN 5 Na m N N :3: u I y \l. en Ll Mn N \N Q 1 1T N N N m \w. m

s rm r MM. m m y W 4 M Patented Dec. 18, 1928 nnrrso S ATES PA orr ceg TENT Jenn MACKENZIE, or MINNEAPOLIS,- MJNNESOTA; ASSIGNOR or ONE-HALF "I'O WALTER HEYNACI-IER, or MINNEAPOLIS, MINNESOTA.

GAS PRODUCING AND HEATING APPLIANCE.

A pplication filed May 22, 1925.- Serial No. 32,125.,

My invention relatesto improvements in gas producing and heating appliances, the same being particularly, though not exclusively, designed for use in connection with heating plants for dwellings.

An object 01. the invention is to supply a relatively simple appliance for supplying gas tov be burned in a heater, said means providing forthe eiilcient combustionof such gas and for safety and convenience in the use of the, appliance.

WVith the foregoing and otherobjects in. view, which will appear in the following d esc'ription, the invention resides in the novel combination and arrangement of-parts and in the details of construction hereinafter described and claimed. k

In the drawings, Fig, 1 is a view of an appliance embodyingmy invention, the same being illustrated partly in elevation, and partly diagrammatically, portions of certain parts being hrokenaway to disclose'structure: that otherwise, would be: concealed and Fig. 2v is a view mainly in plan, but partly in diagram, the same illustrating the appliance shown in Fig. 1. i f p In the drawings, wherein similar reference. characters are, used to. designate similar ,parts, A indicates, a furnace in whicha burner is, placed, said furnace being supplied with a fine 11 for the discharge of burned gases therefrom. An driven by an electric motor'13, divided b from. T e air pipe 15 leads into the top of a closed 'tank 16 for liquid fuel, the terminal has its output of said pipe 15 comprising a'fiexible tube; 15

fitted with a fioat'1'7 at it. free open end, said float being adaptedto keep saidjfend of said tube submerged at a] constant depth beneath I the surface of the fluid. Av gas lead. 18 taking oif from the top of the tank" 16 conducts carbureted air from said tank to the; burner 10. The air pipe 14, leading from the blower 12,. connects with thegas lead 18 at a point, near the burner 10 and mixes fresh air with the carbureted air. in said lead. A hand.

valve 19 in the gas lead and asimilar valve .20 in the air pipe 14,fboth only slightly in advance of the junction between the air pipe 14 and the gas lead 18, provide for regulating the admixture of gas and air entering the burner 10. A pilot pipe 21 takingoif from the lead 18 extends to the burner 10. Fitted in the gas lead 18 at a point between air blower 12,

two air pipes 14, 15 leadingtherepart, of its the burner 10 and the junction between the air pipe 14 and the lead 18, is a cut-off valve so A chain 28 attached to the lever 24 withan arm 27 on-the shaft, 28

from upstanding position to pendant position, said arm 27 opens the valve 22 and, in returning, allows said valve to. be closed. by the weight 25. I

The. motor 13 operates constantly in the absence of accidental interruption ofthe fiow of Current through the conductors, 29, 30. to. said motor. The 'fan 12 of the'blower 12, driven by the motor 18, propelsair intothe air pipes 1,4,,15 only in quantity directly proportionateto the. output, of said pipes. Thus,it,will bennderstood that when. thecutofi'valve 22 iscl'osed, the action oftheblo-wer 12' merely produces enough carbureted air to supply the pilot pipe 2l afnd= whensaid cut oif'valve 22 is open the action of said blower not only supplies thegas lead-18 with tresh airfrom the, pipe14, but increasesthe production of carbureted air to supplythe burner 10; V Inthis connection attention is invited-to a check valve 31 fitted in the lead 19 be; tween the point where thepilot pipe 21 con nects, therewith and the junction between. the air pipe 14 and said gas lead 18. Thischeck valVeQSIoperates to preventback pressure in the gas lead 18 when the cut-01f valve 22 is. closed and avoids interference that otherwise would obtain in the production of carbureted air foradditional outletsin advance of said check valve, 31. One. suchadditional outlet from said gas lead 18 may comprise a branch lead as at 32, which is shown feeding into a water heater 33. V

The blower 12 has an air ingress pipe 3.4 leading thereto, said pipe being disposed through length within the flue 11. Air passing through this ingress pipe 34 is heated with the result that heated air is carbureted in the tank 16. and heated fresh air is mixed, next to the burner 10, with the warm carbureted air in the lead 18. To increase the temperature of the carbureted air in its pasother of said valves being sage from the tank 16 to the burner 10, a part of the gas lead 18 is disposed in near proximity to the flue 11. Thus it will be seen that by having a part of the air ingress pipe 8 1 within the flue 11 and a part of the gas lead 18 disposed closely against said flue at the outside thereof, I advantageously employ, in substantial amount, the heat from the flue that otherwise would be wasted.

To avoid wasting fuel and to avoid the danger of liberating carbureted air, I provide identical safety valves 85, one for each outlet from the gas lead 18. One valve is fitted in the gas lead 18 in advance of the point where the pilot pipe 21 is connected therewith, an-

fitted in the branch lead 82 to the water heater'88. Each safety valve 85 includes a fulcrumed lever 86 connected with the valve stem 87 thereof, said lever being supplied with a weight 88 for closing the valve and with an armature core 89 hanging in a solenoid winding 40. Each winding 40 of each valve 85 is included in 'the circuit of the motor 18 and said wind- "ings are constructed to exert only sufficient attractive force upon their respective armature cores to barely hold the levers 86, against the action of the weights 88, in valve opening position. Said windings 10, deenergized by an interruption of current in the motor circuit, permit the valves 85 to be closed by the weights 88. Resumption of current in said circuit, without the resetting of the valves 85 is attended only with the spinning of the fan 12 and that entirely without effect V since said valves prevent the delivery of any carbureted air from the appliance. With the current reestablished in the motor circuit, a user may tilt any one of the levers 36, against theaction of its weight 88, until the armature core 89, carried by said lever, is fully depressed. core, the valve is open within its winding 40 where it will be held by the attractive force thereof. Having opened the safety valve 85 for any given burner, such burner ma 1 be re-lighted.

Changes in the speci 0 form of my invention, as herein disclosed, may be made within thescope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. The combination with a heater, of a burner within the heater, a blower, an electric motor for driving the same, air pipes leading from said blower and dividing the output thereof, a tank for liquid fuel, one of said air pipes issuing into the liquid in said tank, a lead for conducting carbureted air from said tank to said burner, an electrically controlled safety valve fitted in said carbureted air lead and connected in the motor circuit, said valve being required to be opened manu- In such position of said armature and said core disposed permit only of the flow therethrough of car-- bureted air toward the burner, a pilot lead taking off from the carbureted air lead at a point between the safety valveand said check valve, a cut-off valve fitted in the can bureted air lead between the burner and the junction of said second air pipe with said carbureted air lead, and means for opening and closing said cut-off valve to put the burner into and out of operation.

2. In combination, a burner, pipes leading from said blower and d viding the output thereof, a tank for-liquid fuel, one

of said air pipes issuing into the liquid in said tank, a lead for conducting carbureted air from said tank to said burner, a cut-o'fi valve in said carbureted air lead, the'other of said pipes being connected with said lead at a point between said cut-off valve and tank, and a check valve fitted inthe carbureted air lead at a point between the tank and the junction of said second pipe with said carbureted air lead, said check valve being adapted to permit only of the passage of carbureted air therethrough toward said burner.

8. In combination, a nected therewith, a normally constantly driven blower for propelling fluid fuel through said lead to said burner, an electric motor for driving said blower, an electrically controlled valve fitted in said lead, an electric circuit common to said motor and valve, said valve being required to be opened manually, but adapted automatically to be held open electrically upon the maintenance of currentjin a blower, air

burner, a lead consaid circuit and automatically to close upon the interruption of such current.

4;. In combination, a burner, a blower, air pipes leading from said blower and dividing the output thereof, a tank for liquid fuel, one of said air pipes issuing into the liquid in said tank, a lead for conducting carbureted air from said tank to said burner, the other of said pipes being connected with said lead at a point between the burner and tank, and a check valve fitted in said lead between the' tank and ,the junction of said second pipe with said lead, said check valve being adapted to permit only of thepassage of carbureted air therethrough toward said burner.

5. The combination with a heater having a flue for the discharge of burned gases, of a burner, a blower, air pipes leading from said blower and dividing the output thereof, a tank for liquid fuel, one of said air pipes issuing into the liquid in said tank, a lead for conducting carbureted air from said tank to the burner, the other of said pipes being connected with said lead at a point between the burner and tank, an air ingress conduit for conducting air to the blower, said conduit and said carbureted air lead being associated with said flue to cause the/contents thereof to be heated by the gases in the flue, whereby air going to the tank is heated to promote the carburetion thereof and whereby the carbureted air and the air to be mixed therewith are heated to promote the admixture thereof and prepare the mixture for combustion at the burner.

6. In combination, a plurality of leads fed from a common source, a plurality of burners,

one for each lead, a normally constantly driven blower for propelling fuel through said leads to their respective burners, an electric motor for driving said blower, a plurality of electrically controlled valves, one for each burner, each valve being fitted in the lead of its respective burner, an electric circuit common to said valves and motor, each valve being required to be opened manually, but adapted automatically to be held open electrically upon the n'iaintenanceof current in said circuit and automatically to close upon the interru'ption 01 such current-Q c name to this specification.

JOHN MACKENZIE.

In testimony whereof, I have signed my 

